There is plenty of review literature on FBDD and the following articles should provide a good introduction to the field.
Hesterkamp & Whittaker, Fragment-based activity space: Smaller is better. Curr. Opin. Chem. Biol. 2008, 12, 260-268. DOI
Congreve et al, Recent Developments in Fragment-Based Drug Discovery, J. Med. Chem. 2008, 51, 3661-3680 DOI
Hajduk & Greer, A decade of fragment-based drug design: strategic advances and lessons learned Nat. Rev. Drug Discov. 2007, 6, 211-219 DOI
Albert et al, An Integrated Approach to Fragment Based Lead Generation: Philosophy, Strategy and Case Studies from AstraZeneca's Drug Discovery Programs Curr. Top. Med. Chem. 2007, 7, 1600-1629 link
Erlanson et al, Fragment-Based Drug Discovery J. Med. Chem. 2004, 47, 3463-3482 DOI